Superchips Cortex for 01-08 GMC Duramax

$379.99

Simply stated, Cortex from Superchips is the meanest street-legal programmer you can buy with an industry-first two-year powertrain warranty.

Cortex pumps up the performance by as much as 318 lbs.-ft of torque and 154 horsepower at the rear wheels! And the engineers at Superchips give you more power throughout the driving range, not just at wide-open throttle.

In addition to power increases, Cortex lets you adjust transmission shifts, move the engine rev limiter and change the speedometer calibration. You can also view a ton of stats like how fast your vehicle is smoking down the 1/4-mile after you’ve loaded the top-dog calibration.